Eigenschaft 'EmployeeID' nicht gefunden am Typ bean.Employee

Question

Ich versuche, alle Liste der Mitarbeiter in einer Tabelle anzuzeigen und löschen Sie es auch an der gleichen Tabelle. Aber dieser Fehler belästigt mich weiter. Was könnte sein Grund sein?

May 28, 2017 9:25:27 PM 
org.apache.catalina.core.ApplicationDispatcher invoke 
SEVERE: Servlet.service() for servlet jsp threw exception 
javax.el.PropertyNotFoundException: Property 'EmployeeID' not found on type bean.Employee 

May 28, 2017 9:25:27 PM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [DisplayAllEmp] in context with path [/ELMS] threw exception [An exception occurred processing JSP page /elms/elms_skms/DeleteEmployeeAcc.jsp at line 55 

52:          <tbody> 
53:           <c:forEach items="${employee}" var="emp"> 
54:            <tr> 
55:             <td><c:out value="${emp.EmployeeID}" /></td> 
56:             <td><c:out value="${emp.EmployeeIC}" /></td> 
57:             <td><c:out value="${emp.EmployeeName}" /></td> 
58:             <td><c:out value="${emp.EmployeePosition}" /></td> 


Stacktrace:] with root cause 
javax.el.PropertyNotFoundException: Property 'EmployeeID' not found on type bean.Employee 
    at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:266) 
    at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243) 

Hier ist meine jsp Seite:

<div class="module-body table"> 
<form name = delete" method="POST" action="DeleteEmployeeServlet"> 
<table cellpadding="0" cellspacing="0" border="0" class="datatable-1 table 
table-bordered table-striped  display" width="50%"> 

<thead> 
<tr> 
<th>Employee ID</th> 
<th>Employee IC</th> 
<th>Employee Name</th> 
<th>Employee Position</th> 
<th>Employee Session</th> 
<th>Employee Grade</th> 
<th>Action</th> 
</tr> 
</thead> 
<tbody> 
<c:forEach items="${employee}" var="emp"> 
<tr> 
<td><c:out value="${emp.EmployeeID}" /></td> 
<td><c:out value="${emp.EmployeeIC}" /></td> 
<td><c:out value="${emp.EmployeeName}" /></td> 
<td><c:out value="${emp.EmployeePosition}" /></td> 
<td><c:out value="${emp.EmployeeSession}" /></td> 
<td><c:out value="${emp.EmployeeGrade}" /></td> 
<td><a href="DeleteEmployeeServlet?table=employee&employeeid=<c:out 
    value="${emp.EmployeeID}" />"onclick="return confirm('Are you 
    sure?');"><i class="icon-trash"></i></a> <br></td> 
</c:forEach> 
</tbody> 

Hier ist meine Servlet-Seite:

package servlet; 

import java.io.IOException; 
import java.sql.SQLException; 
import java.util.Date; 

import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 

import model.EmployeeDAO; 
import bean.Employee; 

public class DeleteEmployeeServlet extends HttpServlet { 
    private static final long serialVersionUID = 1L; 
    private EmployeeDAO dao; 

    public DeleteEmployeeServlet() { 
     super(); 
     dao = new EmployeeDAO(); 
    } 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     String forward = ""; 
     String table = request.getParameter("table"); 
     if(table.equalsIgnoreCase("employee")){ 
      int id = Integer.parseInt(request.getParameter("EmployeeID")); 
      dao.DeleteEmployeeDetails(id); 
      forward = "DisplayAllEmp?table=employee"; 
     } 
     RequestDispatcher view = request.getRequestDispatcher(forward); 
     view.forward(request, response); 
    } 

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {} 

} 

Hier ist mein Modell/DAO (viewEmployee):

public List<Employee> viewEmployee() { 
     List<Employee> employee = new ArrayList<Employee>(); 
     try { 
      currentCon = ConnectionManager.getConnection(); 
      stmt = currentCon.createStatement(); 
      ResultSet rs = stmt.executeQuery("select * from employee"); 
      while (rs.next()) { 
       Employee e = new Employee(); 
       e.setEmployeeID(rs.getInt("EmployeeID")); 
       e.setEmployeePassword(rs.getString("EmployeePassword")); 
       e.setEmployeeName(rs.getString("EmployeeName")); 
       e.setEmployeeIC(rs.getString("EmployeeIC")); 
       e.setEmployeeGender(rs.getString("EmployeeGender")); 
       e.setEmployeeEmail(rs.getString("EmployeeEmail")); 
       e.setEmployeePhoneNo(rs.getString("EmployeePhoneNo")); 
       e.setEmployeeStreet1(rs.getString("EmployeeStreet1")); 
       e.setEmployeeStreet2(rs.getString("EmployeeStreet2")); 
       e.setEmployeePCode(rs.getInt("EmployeePCode")); 
       e.setEmployeeCity(rs.getString("EmployeeCity")); 
       e.setEmployeeState(rs.getString("EmployeeState")); 
       e.setEmployeeQualification(rs.getString("EmployeeQualification")); 
       e.setEmployeePosition(rs.getString("EmployeePosition")); 
       e.setEmployeeSession(rs.getString("EmployeeSession")); 
       e.setEmployeeGrade(rs.getInt("EmployeeGrade")); 
       e.setEmploymentDate(rs.getDate("EmploymentDate")); 
       employee.add(e); 
       System.out.println("Employee id: " + e.getEmployeeID()); 
      } 
      System.out.println("All rows from table view Employee retrieved!"); 
     } catch (SQLException e) { 
      System.out.println("Failed: An SQL Exception occured : " + e); 
      e.printStackTrace(); 
     } 
     return employee; 
    } 

Hier ist mein DAO für DisplayAllEmp:

public void DeleteEmployeeDetails(int id) { 
     try { 
      currentCon = ConnectionManager.getConnection(); 
      ps = currentCon.prepareStatement("delete from employee where employeeID=?"); 
      // Parameters start with 1 
      ps.setInt(1, id); 
      ps.executeUpdate(); 
      System.out.println("1 row of table Employee has been deleted. employeeID:" + id); 
     } catch (SQLException e) { 
      e.printStackTrace(); 
     } 
    } 

Hier ist meine Bohne (Mitarbeiter):

package bean; 

import java.util.Date; 

public class Employee { 

    private int EmployeeID; 
    private String EmployeePassword; 
    private String EmployeeName; 
    private String EmployeeIC; 
    private String EmployeeGender; 
    private String EmployeeEmail; 
    private String EmployeePhoneNo; 
    private String EmployeeStreet1; 
    private String EmployeeStreet2; 
    private int EmployeePCode; 
    private String EmployeeCity; 
    private String EmployeeState; 
    private String EmployeeQualification; 
    private String EmployeePosition; 
    private String EmployeeSession; 
    private int EmployeeGrade; 
    private Date EmploymentDate; 
    private boolean valid; 

    public Employee() { 
     EmployeeID = 0; 
     EmployeePassword = null; 
     EmployeeName=null; 
     EmployeeIC=null; 
     EmployeeGender=null; 
     EmployeeEmail=null; 
     EmployeePhoneNo=null; 
     EmployeeStreet1=null; 
     EmployeeStreet2=null; 
     EmployeePCode=0; 
     EmployeeCity=null; 
     EmployeeState=null; 
     EmployeeQualification=null; 
     EmployeePosition=null; 
     EmployeeSession=null; 
     EmployeeGrade=0; 
     EmploymentDate=null; 
    } 

    public Employee(int employeeID, String employeePassword, String employeeName, String employeeIC, String employeeGender, String employeeEmail, String employeePhone, String employeeStreet1, String employeeStreet2, int employeePCode, String employeeCity, String employeeState, String employeeQuaification, String employeePosition, String employeeSession, int employeeGrade, Date employmentDate) { 
     EmployeeID = employeeID; 
     EmployeePassword = employeePassword; 
     EmployeeName=employeeName; 
     EmployeeIC=employeeIC; 
     EmployeeGender=employeeGender; 
     EmployeeEmail=employeeEmail; 
     EmployeePhoneNo=employeePhone; 
     EmployeeStreet1=employeeStreet1; 
     EmployeeStreet2=employeeStreet2; 
     EmployeePCode=employeePCode; 
     EmployeeCity=employeeCity; 
     EmployeeState=employeeState; 
     EmployeeQualification=employeeQuaification; 
     EmployeePosition=employeePosition; 
     EmployeeSession=employeeSession; 
     EmployeeGrade=employeeGrade; 
     EmploymentDate=employmentDate; 
    } 

    public int getEmployeeID() {return EmployeeID;} 
    public void setEmployeeID(int employeeID) {EmployeeID = employeeID;} 

    public String getEmployeePassword() {return EmployeePassword;} 
    public void setEmployeePassword(String employeePassword) {EmployeePassword = employeePassword;} 

    public String getEmployeeName() {return EmployeeName;} 
    public void setEmployeeName(String employeeName) {EmployeeName = employeeName;} 

    public String getEmployeeIC() {return EmployeeIC;} 
    public void setEmployeeIC(String employeeIC) {EmployeeIC = employeeIC;} 

    public String getEmployeeGender() {return EmployeeGender;} 
    public void setEmployeeGender(String employeeGender) {EmployeeGender = employeeGender;} 

    public String getEmployeeEmail() {return EmployeeEmail;} 
    public void setEmployeeEmail(String employeeEmail) {EmployeeEmail = employeeEmail;} 

    public String getEmployeePhoneNo() {return EmployeePhoneNo;} 
    public void setEmployeePhoneNo(String employeePhoneNo) {EmployeePhoneNo = employeePhoneNo;} 

    public String getEmployeeStreet1() {return EmployeeStreet1;} 
    public void setEmployeeStreet1(String employeeStreet1) {EmployeeStreet1 = employeeStreet1;} 

    public String getEmployeeStreet2() {return EmployeeStreet2;} 
    public void setEmployeeStreet2(String employeeStreet2) {EmployeeStreet2 = employeeStreet2;} 

    public int getEmployeePCode() {return EmployeePCode;} 
    public void setEmployeePCode(int employeePCode) {EmployeePCode = employeePCode;} 

    public String getEmployeeCity() {return EmployeeCity;} 
    public void setEmployeeCity(String employeeCity) {EmployeeCity = employeeCity;} 

    public String getEmployeeState() {return EmployeeState;} 
    public void setEmployeeState(String employeeState) {EmployeeState = employeeState;} 

    public String getEmployeeQualification() {return EmployeeQualification;} 
    public void setEmployeeQualification(String employeeQualification) {EmployeeQualification = employeeQualification;} 

    public String getEmployeePosition() {return EmployeePosition;} 
    public void setEmployeePosition(String employeePosition) {EmployeePosition = employeePosition;} 

    public String getEmployeeSession() {return EmployeeSession;} 
    public void setEmployeeSession(String employeeSession) {EmployeeSession = employeeSession;} 

    public int getEmployeeGrade() {return EmployeeGrade;} 
    public void setEmployeeGrade(int employeeGrade) {EmployeeGrade = employeeGrade;} 

    public Date getEmploymentDate() {return EmploymentDate;} 
    public void setEmploymentDate(Date employmentDate) {EmploymentDate = employmentDate;} 

    public boolean isValid() {return valid;} 
    public void setValid(boolean valid) {this.valid = valid;} 

} 

Answer 1

Ihre Employee Klasse nur private Felder hat, daher kann man sie nicht Punktnotation verwendet zuzugreifen. Die setters und getters sind öffentlich und zugänglich außerhalb der Klasse. Verwenden Sie sie, um die gewünschten Informationen in Ihrer jsp Datei abzurufen. Weitere Informationen finden Sie auf der Oracle Dokumentation Seite Declaring Member Variables, Abschnitt Access Modifiers.

• öffentlicher Modifikator-das Feld aus allen Klassen zugänglich.

• privater Modifikator - das Feld ist nur innerhalb seiner eigenen Klasse zugänglich.

Wenn Sie schreiben ${emp.EmployeeID}, Sie für ein Feld fragen EmployeeID benannt, die public Zugriffsmodifikator hat, die es nicht gibt.